70225381 has 4 divisors (see below), whose sum is σ = 70949452. Its totient is φ = 69501312.

The previous prime is 70225367. The next prime is 70225403. The reversal of 70225381 is 18352207.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18352207 = 1187 ⋅15461.

It can be written as a sum of positive squares in 2 ways, for example, as 17430625 + 52794756 = 4175^2 + 7266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70225381 is a prime.

It is a super-2 number, since 2×70225381² = 9863208273190322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70225081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361890 + ... + 362083.

It is an arithmetic number, because the mean of its divisors is an integer number (17737363).

Almost surely, 2^70225381 is an apocalyptic number.

It is an amenable number.

70225381 is a deficient number, since it is larger than the sum of its proper divisors (724071).

70225381 is an equidigital number, since it uses as much as digits as its factorization.

70225381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724070.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 70225381 is about 8380.0585320152. The cubic root of 70225381 is about 412.5703701189.

Adding to 70225381 its reverse (18352207), we get a palindrome (88577588).

It can be divided in two parts, 7022 and 5381, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 70225381 in words is "seventy million, two hundred twenty-five thousand, three hundred eighty-one".