155121451 has 2 divisors, whose sum is σ = 155121452. Its totient is φ = 155121450.

The previous prime is 155121433. The next prime is 155121469. The reversal of 155121451 is 154121551.

It is a balanced prime because it is at equal distance from previous prime (155121433) and next prime (155121469).

It is a cyclic number.

It is not a de Polignac number, because 155121451 - 2¹¹ = 155119403 is a prime.

It is not a weakly prime, because it can be changed into another prime (155121151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77560725 + 77560726.

It is an arithmetic number, because the mean of its divisors is an integer number (77560726).

Almost surely, 2^155121451 is an apocalyptic number.

155121451 is a deficient number, since it is larger than the sum of its proper divisors (1).

155121451 is an equidigital number, since it uses as much as digits as its factorization.

155121451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 25.

The square root of 155121451 is about 12454.7762324339. The cubic root of 155121451 is about 537.3087992012.

The spelling of 155121451 in words is "one hundred fifty-five million, one hundred twenty-one thousand, four hundred fifty-one".