155583551 has 2 divisors, whose sum is σ = 155583552. Its totient is φ = 155583550.

The previous prime is 155583427. The next prime is 155583559. The reversal of 155583551 is 155385551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155583551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155583559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77791775 + 77791776.

It is an arithmetic number, because the mean of its divisors is an integer number (77791776).

Almost surely, 2^155583551 is an apocalyptic number.

155583551 is a deficient number, since it is larger than the sum of its proper divisors (1).

155583551 is an equidigital number, since it uses as much as digits as its factorization.

155583551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75000, while the sum is 38.

The square root of 155583551 is about 12473.3135533426. The cubic root of 155583551 is about 537.8418100624.

The spelling of 155583551 in words is "one hundred fifty-five million, five hundred eighty-three thousand, five hundred fifty-one".