90722551 has 2 divisors, whose sum is σ = 90722552. Its totient is φ = 90722550.

The previous prime is 90722539. The next prime is 90722563. The reversal of 90722551 is 15522709.

It is a balanced prime because it is at equal distance from previous prime (90722539) and next prime (90722563).

It is an emirp because it is prime and its reverse (15522709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90722551 - 2⁵ = 90722519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90722581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45361275 + 45361276.

It is an arithmetic number, because the mean of its divisors is an integer number (45361276).

Almost surely, 2^90722551 is an apocalyptic number.

90722551 is a deficient number, since it is larger than the sum of its proper divisors (1).

90722551 is an equidigital number, since it uses as much as digits as its factorization.

90722551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 90722551 is about 9524.8386338037. The cubic root of 90722551 is about 449.3365548589.

The spelling of 90722551 in words is "ninety million, seven hundred twenty-two thousand, five hundred fifty-one".