402551549 has 2 divisors, whose sum is σ = 402551550. Its totient is φ = 402551548.

The previous prime is 402551507. The next prime is 402551557. The reversal of 402551549 is 945155204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381225625 + 21325924 = 19525^2 + 4618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402551549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402551579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201275774 + 201275775.

It is an arithmetic number, because the mean of its divisors is an integer number (201275775).

Almost surely, 2^402551549 is an apocalyptic number.

It is an amenable number.

402551549 is a deficient number, since it is larger than the sum of its proper divisors (1).

402551549 is an equidigital number, since it uses as much as digits as its factorization.

402551549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 402551549 is about 20063.6873231218. The cubic root of 402551549 is about 738.3696447799.

The spelling of 402551549 in words is "four hundred two million, five hundred fifty-one thousand, five hundred forty-nine".