70421551 has 2 divisors, whose sum is σ = 70421552. Its totient is φ = 70421550.

The previous prime is 70421537. The next prime is 70421579. The reversal of 70421551 is 15512407.

It is a weak prime.

It is an emirp because it is prime and its reverse (15512407) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70421551 - 2¹⁵ = 70388783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70421501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35210775 + 35210776.

It is an arithmetic number, because the mean of its divisors is an integer number (35210776).

Almost surely, 2^70421551 is an apocalyptic number.

70421551 is a deficient number, since it is larger than the sum of its proper divisors (1).

70421551 is an equidigital number, since it uses as much as digits as its factorization.

70421551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 70421551 is about 8391.7549416079. The cubic root of 70421551 is about 412.9541757263.

Adding to 70421551 its reverse (15512407), we get a palindrome (85933958).

The spelling of 70421551 in words is "seventy million, four hundred twenty-one thousand, five hundred fifty-one".