1551402004 has 6 divisors (see below), whose sum is σ = 2714953514. Its totient is φ = 775701000.

The previous prime is 1551402001. The next prime is 1551402007. The reversal of 1551402004 is 4002041551.

It is an interprime number because it is at equal distance from previous prime (1551402001) and next prime (1551402007).

It can be written as a sum of positive squares in only one way, i.e., 784112004 + 767290000 = 28002^2 + 27700^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551402001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193925247 + ... + 193925254.

Almost surely, 2^1551402004 is an apocalyptic number.

It is an amenable number.

1551402004 is a deficient number, since it is larger than the sum of its proper divisors (1163551510).

1551402004 is a wasteful number, since it uses less digits than its factorization.

1551402004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387850505 (or 387850503 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1551402004 is about 39387.8408141396. The cubic root of 1551402004 is about 1157.6433536282.

Adding to 1551402004 its reverse (4002041551), we get a palindrome (5553443555).

The spelling of 1551402004 in words is "one billion, five hundred fifty-one million, four hundred two thousand, four".