70537921 has 2 divisors, whose sum is σ = 70537922. Its totient is φ = 70537920.

The previous prime is 70537919. The next prime is 70537949. The reversal of 70537921 is 12973507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 5574321 = 8060^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 70537921 - 2¹ = 70537919 is a prime.

Together with 70537919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (70537991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35268960 + 35268961.

It is an arithmetic number, because the mean of its divisors is an integer number (35268961).

Almost surely, 2^70537921 is an apocalyptic number.

It is an amenable number.

70537921 is a deficient number, since it is larger than the sum of its proper divisors (1).

70537921 is an equidigital number, since it uses as much as digits as its factorization.

70537921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 70537921 is about 8398.6856709845. The cubic root of 70537921 is about 413.1815163194.

The spelling of 70537921 in words is "seventy million, five hundred thirty-seven thousand, nine hundred twenty-one".