70621261 has 2 divisors, whose sum is σ = 70621262. Its totient is φ = 70621260.

The previous prime is 70621259. The next prime is 70621267. The reversal of 70621261 is 16212607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56700900 + 13920361 = 7530^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 70621261 - 2¹ = 70621259 is a prime.

Together with 70621259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70621267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35310630 + 35310631.

It is an arithmetic number, because the mean of its divisors is an integer number (35310631).

Almost surely, 2^70621261 is an apocalyptic number.

It is an amenable number.

70621261 is a deficient number, since it is larger than the sum of its proper divisors (1).

70621261 is an equidigital number, since it uses as much as digits as its factorization.

70621261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 70621261 is about 8403.6456969580. The cubic root of 70621261 is about 413.3441758487.

Adding to 70621261 its reverse (16212607), we get a palindrome (86833868).

The spelling of 70621261 in words is "seventy million, six hundred twenty-one thousand, two hundred sixty-one".