70251621 has 8 divisors (see below), whose sum is σ = 102184224. Its totient is φ = 42576720.

The previous prime is 70251617. The next prime is 70251631. The reversal of 70251621 is 12615207.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70251621 - 2² = 70251617 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 70251591 and 70251600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70251631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064386 + ... + 1064451.

It is an arithmetic number, because the mean of its divisors is an integer number (12773028).

Almost surely, 2^70251621 is an apocalyptic number.

It is an amenable number.

70251621 is a deficient number, since it is larger than the sum of its proper divisors (31932603).

70251621 is a wasteful number, since it uses less digits than its factorization.

70251621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128851.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 70251621 is about 8381.6240073151. The cubic root of 70251621 is about 412.6217499204.

Adding to 70251621 its reverse (12615207), we get a palindrome (82866828).

It can be divided in two parts, 7025 and 1621, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 70251621 in words is "seventy million, two hundred fifty-one thousand, six hundred twenty-one".